Dyeing aniline-black



U ITED STATES PATENT OF ICE.

ALEXANDRE N.- DUBOIS, or PHILADELPHIA, PENNSYLVANIA.

DYEING ANlLlNE-BL ACK.

SPECIFICATION forming part of Letters Patent No. 283,220, dated August 14, 1883,

Application filed Apiil 14, 1883.

Be it known that I, ALEXANDRE N. DUBOIS,

of Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in the Process of Dyeing Aniline-Black, of which the following is a specification.

My invention relates to the dyeing of cotton, cloth, yarn, and'vegetable fabrics through the medium of aniline,- and the object of my invention isto obtain economy and simplicity in the dyeing, the production on the materials ("if an indelible black, and to greatly short-en the time required to dye the goods over the processes now in use. 7

My dyeing-bath is composed as follows: I take of the weight of the material to be dyed about'eight hundred per cent. of tepid water, and in it I dissolve eight per cent. of aniline salt, four per cent. hydrochloric acid at 22 Baum, eight per cent. sulphuric acid at 66 Baum, twelve per cent.sulphate of soda, and fourteen per cent. bichromate of potash. This bath is thoroughly moved or stirred, and the (No specimens.)

fabrics to be dyed are placed in it and moved around or worked from forty to fifty minutes, then taken out, washed well in cold water, and dried and finished in the usual manner. This bath is adapted for dyeing cotton, yarn, cloth, and textile fabrics of all kinds.

I do not limit myself to the proportions specified above, as they may be varied to suit the diii'erent requirements of the differentsubstances to be dyed.

Having thus described my invention, I claim- The process of dyeing cotton, cloth, yarn, and fabrics of all kinds, consisting in immersing them in a bath composed of water, aniline salt, hydrochloric acid, sulphuric acid, sulphate of soda, and bichromate of potash, in or about the proportions specified.

. In testimony whereof I affix my signature in presence of two witnesses.

ALEXANDER N. DUBOIS.

XVitnesses:

CHRISTOPHER FALLON, GEO. DENGLER. 

